案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<body>
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​
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<script>
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cars=["BMW","Volvo","Saab","Ford"];
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var i=0;
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while (cars[i])
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{
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document.write(cars[i] + "<br>");
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i++;
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}
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</script>
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​
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</body>
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</html>
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​